486 PALEONTOLOGY OF ILLINOIS. 



Paor. 



Tanodus polymorphic, St. J. aud W., Chester, - - - 380 



Ctenoptychius, Agassiz, - - - 382 



— pertenuis, St. J. aud W., Chester, .... 3S2 



— Stevensoni, St. J. and W., Coal Meas., - - 383 

 Polyrhizodus, McCoy, 384 



— Williamsi, St. J. and W., Keokuk, .... 384 



— nanus, St. J. and W., Keokuk, .... 386 



— Piasaensis, St. J. and W., Warsaw, .... 386 



— amplus, St. J. and W., St. Louis, - 387 



— carbonarius, St. J. and W., Coal Meas., - - - 389 

 Dactylodus, N. and W„ 390 



— concarus, St. J. and W., St. Louis, - - - 390 



— minimus, St. J. aud W., St. Louis, - - - . 391 



— excavatus, St. J. and W., Chester, .... 392 

 Antliodus, N. and W., .... ... 393 



— perovalis, St. J. and W., Warsaw, .... 393 



— gracilis, St. J. and W., Warsaw, .... 393 

 Petalodus, Owen, 394 



— liybridus, St. J. aud W., St. Louis, ... 394 



— proximus, St. J. and W., Coal Meas., - - - 395 

 Ctenopetalus, Agassiz, - 390 



— vinosus, St. J. aud W., Keokuk, .... 390 



— hellulus, St. J. and W., St. Louis, .... 398 



— limatidus, St. J. aud W., Chester, .... 399 



— medius, St. J. and W., Chester, .... 400 



— occidentalis, St. J. and W., Coal Meas., - - - 401 

 Pristodus, Agassiz, 402 



— ? acuminatus, St. J. and W., Kinderhook, - - 402 . 

 Calopodus, St. J. aud W., 403 



— apicalis, St. J. and W., Coal Meas., - - - 403 

 PetaJorhynchus, Agassiz, 405 



— pseudosagittatus, St. J. aud W., St. Louis, - - - 405 



— distortus, St. J. and W., St. Louis, - - - 406 



— spatulatus, St. J. and W., St. Louis, - - - r 408 

 Peltodus, K and W., 409 



— quadratic, St. J. and W., St. Louis, .... 410 



— ? plicomphalus, St. J. and W., Chester, - - - 411 



— transversus, St. J. and W., Coal Meas., - - - 412 

 Fissodus, St. J. aud W., 413 



— bifidus, St. J. and W., Chester, .... 414 



— tricnspidatus, St. J. and W., Chester, - - - 415 

 Cholodus, St. J. and W., 415 



— inccqualis, St. J. and W., TJ. Coal Meas., - - 416 



